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If you have an old motor/bearing assembly type pump (see pic of red pump (typical) then a noisy start up is probably a sign of an impending failure. If it looks just like the one in the pic then it may be repairable. If you have a cartridge type pump (pic of green pump is typical of the style) then there may just be some debris caught in the pump. Either way it's best to have it checked out before a possible failure.
Cartridge pump pic attached
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